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Leases - Additional Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
lease
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
lease
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Lessee, Lease, Description [Line Items]          
Operating Lease, Payments $ 3,709   $ 7,372    
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 1,017   65,263    
Operating lease cost $ 4,157   $ 8,280    
Weighted-average remaining lease term - operating leases 6 years 1 month 28 days   6 years 1 month 28 days    
Extension options, term of extension     5 years    
operating lease right-of-use assets $ 60,064   $ 60,064   $ 0
operating lease liabilities 61,214   61,214   $ 0
Short term operating lease liability 12,500   12,500    
Long term operating lease liability $ 48,700   $ 48,700    
Number of leases extended | lease     7    
Lessee, Operating Lease, Number of New Leases Added | lease 2        
Rent expense $ 4,800 $ 4,500 $ 9,500 $ 9,000  
Short term lease cost 0   9    
Variable lease cost 833   1,536    
Sublease Income 156   313    
Lease, Cost $ 4,834   $ 9,512    
Weighted-average discount rate - operating leases 3.21%   3.21%    
Minimum          
Lessee, Lease, Description [Line Items]          
Weighted-average remaining lease term - operating leases 1 year   1 year    
Extension options, term of extension     1 year    
Maximum          
Lessee, Lease, Description [Line Items]          
Weighted-average remaining lease term - operating leases 11 years   11 years    
Extension options, term of extension     5 years